如何将列表视图中的数据从一个片段发送到另一个片段

Question

我有几个列表视图项目，当我单击特定的列表视图时，我需要转到 Fragment_2 并单击一个列表视图的值。我在 Fragment_1 上尝试下面的代码，我得到了它在 Tosat 通知中显示的正确值，但在 Fragment_2 中 bundle 总是空的。

在Fragment_1

的onCreate方法中

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                String value = ((TextView) view.findViewById(R.id.username)).getText().toString();
                MainFragment fragment = new MainFragment ();
                Bundle bundle = new Bundle();
                bundle.putString("view", value);
                Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
                fragment.setArguments(bundle);

在Fragment_2

的onCreate方法中

 Bundle bundle = this.getArguments();
        if (bundle != null) {
            String myString = bundle.getString("view");
            Toast.makeText(getContext(), myString, Toast.LENGTH_SHORT).show();

UDPATE:

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                String value = ((TextView) view.findViewById(R.id.username)).getText().toString();
                MainFragment fragment = new MainFragment ();
                Bundle bundle = new Bundle();
                bundle.putString("view", value);
                Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
                fragment.setArguments(bundle);

                if (position == 0) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);

                }

                if (position == 1) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);
                }

                if (position == 2) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);
                }

                if (position == 3) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);
                }

                            // ETC .......
            }
        });

Answer 1

只需在 onItemClick 方法中替换以下代码即可。

            String value = ((TextView) 
            view.findViewById(R.id.username)).getText().toString();
            Bundle bundle = new Bundle();
            bundle.putString("view", value);
            Intent myIntent = new Intent(view.getContext(), MainActivity.class);
            myIntent.putExtra(bundle);
            startActivityForResult(myIntent, 0);

在 MainActivity 上像这样替换您的 MainFragment，

            MainFragment fragment = new MainFragment ();
            fragment.setArguments(getIntent().getExtras());

            getSupportFragmentManager()
              .beginTransaction()
              .replace("your fragment container id here", fragment)
              .commit();

Answer 2

您正在启动 Activity "MainActivity.class" 并将您的包传递给 Fragment class "MainFragment" 但从未真正启动 MainFragment。因此，很明显您的代码将无法正常工作

Answer 3

你没有提交片段

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                String value = ((TextView) view.findViewById(R.id.username)).getText().toString();
                MainFragment fragment = new MainFragment ();
                Bundle bundle = new Bundle();
                bundle.putString("view", value);
                Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
                fragment.setArguments(bundle);

// This line is important
getSupportFragmentManager().beginTransaction().add(R.id.container, fragment).commit();

Answer 4

您正在调用 activity 那么如何获取片段中的数据，如果您这样做的话：

首先，您要通过

启动 activity

  Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                startActivityForResult(myIntent, 0);

然后在此 activity 中您将启动片段

getFragmentManager().beginTransaction().replace("your fragment container id here", 
fragment).commit();

在这种情况下，首先像这样将数据传递给意图

  Intent myIntent = new Intent(view.getContext(), MainActivity.class);
     myIntent.putString("data","Put the data which you want to pass");
                startActivityForResult(myIntent, 0);

并使用包将此数据传递给片段希望它对你有用。

如何将列表视图中的数据从一个片段发送到另一个片段

How to send data from listview from one fragment to another

java

android

listview

bundle

android-fragments